#app {
    height: 100%;
    overflow: hidden;
    background: black;
    min-width: 300px;
}

main {
    display: flex;
    height: 100%;
}

#left {
    background: red;
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    justify-content: flex-start;
    align-items: stretch;
    align-content: flex-start;
}

#right {}

.box {
    width: 50px;
    height: 50px;
    background: rebeccapurple;
}
